Questions tagged [motor]

An electrical actuator that converts electrical energy into rotational motion or sustained linear motion (linear motor). There are many types of electric motors. If the specific type of motor is known, it is helpful to use or add a more specific tag, such as dc-motor, brushless-dc motor or induction-motor.

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66 views

First schematics, DC-DC Converter question

I've made my first PCB design and I am unsure about a few things. This is a H-Bridge with a Attiny85. The Attiny85 will read a analog input on PB4 and adjust the PWM based on that. It is powered by a ...
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Operation of a 2 phase servo motorin flight control surfaces

So after doing some research, I briefly know a 2 phase servo motor's operation. I know it has a control and a main winding that is 90 degrees phase different to generate a rotational torque. It also ...
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How to prevent overheating of my ebike system?

I have a Li-ion battery pack 18650 cells with a BMS, 10 in series by 7 parallel. The pack I bought was defective from day one and had a 7 cell row that got hot when charging now I just repaired the ...
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Specifications of a motor which will light an led (momentarily) from hand-spinning?

EDIT: I feel I might have placed the emphasis wrongly in my original question so I'll try to revise it here. In the video cited the demonstrator can be seen spinning a small "hobby" motor ...
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2 phase ac servo motor operation in cotrolling load position and direction [closed]

Hello can someone explain to me how a 2-phase AC servo motor can control the position/direction of a load
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38 views

4 Quadrant DC chopper Operation

can anyone explain 2nd quadrant operation of DC chopper in easy way? may i ask about how brake applied in 2nd quadrant
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I removed a little motor from my laptop fan and it won't run using a 9V battery

I realize this is may be a noob question so please point me to the right place to ask it if this isn't so. Anyway, I'm trying to build a little magnetic blender using a spare laptop fan. I tried ...
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BOOSTXL-DRV8323RS Set up - trying to spin motor in 3x PWM mode

I have been following the datasheet for the TI DRV8323 and the BOOSTXL-DRV8323R dev kit. I am trying to spin a BLDC motor by sending 3 SPWM waves (all 120 degrees phase shifted) generated by an ...
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Hall effect sensor through plastic

I was wondering about the viability of adding a Hall effect sensor which can sense a magnet through a plastic cover. I'm interested measuring the angular velocity of a motor through a plastic cover, ...
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78 views

Will i be able to generate electricity in the following case?

The motor shown is an alternating current, single-phase induction motor of the permanent split capacitor (PSC) type. I i power the electromagnet part with an AC supply of 12V to generate a magnetic ...
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51 views

Servo motors: does neutral position imply a 50% PWM duty cycle?

I'm working on a project using a Savox SB-2290SG servo motor. The datasheet I received is only 3 pages long, and includes limited information on the control interface. I've posted the relevant ...
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How to run 3 motors of cold room sequetntielly each hour [closed]

I want to sequentially run 3 motors: the first motor run for 1 hour, the second for one hour and the third for 1 hour, again the first motor for one hour and so on. I serched for a time relay (only ...
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Ac Fan motor capacitor value

I have a bad 350v 2 uf fan capacitor. I managed to find a 400v 6.3uf cap in my locality, would this work instead of the 2uf one? Thanks.
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Where do I measure the Amp draw of my motor which is connected to a centrifugal fan?

I just started my job as an apprentice technician. For the longest time, my supervisor have always been measuring the amp draws of my motor from the outgoing cable from the motor to the electric panel ...
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Delta and Wye configuration

The problem:Complete the transformer wiring diagrams according to the Delta primary and Wye secondary configuration. The secondary will be configured for High voltage. Connect all loads as needed. ...
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66 views

Unusually clean 5 kHz noise from BLDC motor

The noise does seem to pulsate but I'm not sure how I'd go about measuring the beat frequency. I'm driving this thing with 2 L293D (works fine with just one, heats up a bit though,) and feeding a ...
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Raspberry Pi DC motor control with position feedback

I'm interested in controlling a DC motor using a Raspberry Pi and I want to know the approximate position of the motor. I have seen multiple ESC for sale but most don't appear to provide any feedback, ...
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Requesting Advice For Selecting And Sourcing A “Medium Torque” Motor

For a prototype project I'm building, I need to select a motor. I'm not familiar with different types of motors, so I have been trying to do some research. However, most of the stuff I have been able ...
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Why is this 240V / 20A motor labelled 3HP?

Here's the motor badge: As far as I know, 115 V x 40 A = 230 V x 20 A = 4600 watts which is equivalent to ~6.2 HP, all presumably @ full load. So what does the "3 HP" mean? I know that in ...
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47 views

Need help selecting the right speed controller for a 3-phase AC motor [closed]

This a three-phase single-volt 5-HP AC motor salvaged from a treadmill with a busted controller board. The goal is to salvage the treadmill. Originally I was trying to repair the controller board. I'...
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90 degrees phase shift in AC servo motors

IEEE Article1 and IEEE Article2 In both of these links, its stated that main winding and control winding in an AC servo position motor are 90 degrees displaced from each other. Why is this so? Any ...
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1answer
66 views

Is it safe to use a 120V/60Hz rated espresso machine on a 100V/50Hz grid?

I'm new here and my question is a bit complicated with multiple factors, so please allow me to explain it. I live in Eastern Japan where 100V/50Hz is standard. I intend to use a very expensive 1800W ...
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1answer
66 views

Reading motor limit switches with Arduino

I'm building a window blinds system. I have an arduino powering a motor via a DRV8833 Dual-H bridge controller. At the limits of each direction of motion, I have limit switches that kill the power to ...
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How much high is the amplitude of stator-MMF of 3-phase 2-spp integral slot winding type machine as compared to 3-phase1-spp machine of same type?

Details: No. of POLES=2; i.e 1-pole pair SPP= slots per pole per phase In my case, amplitude of MMF of 3-phase 1-spp machine= 0.75; Then what should be the amplitude of MMF for 2-spp machine ? Is it ...
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2-way DC motor control for greenhouse IoT application

Edit: After doing more research, it seems simply reversing the DC polarity would do the trick as explained here: https://www.precisionmicrodrives.com/content/are-dc-motors-reversible This can be ...
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48 views

Why is my fan circuit with SSRs short circuiting on power down?

I am attempting to build a "smart" ceiling fan for a home automation system I have created and added to over the years. However, this is the first time I've tried controlling a fan motor ...
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Need help identifying wires on 3-phase single-volt AC motor (6 leads)

I'm far from an electrician. Just a guy trying to get some new life out of an existing piece of machinery. See the image below, this 5HP motor comes from a heavy duty commercial treadmill. Based on ...
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1answer
23 views

Using Inductor and Electronic Load Instead of a Permanent Magnet Synchronous Motor (PMSM)

I would like to test whether my power board can handle to currents required to drive a 1.5 kW motor. My issue is that the motor testbench is still not here and I have to test it now. I do not have ...
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110 views

How do i know what resistor value, that's attached to a BLDC motor, i should use in order to get a torque of 100 lb-ft put on my actuator?

Motor P/N is M-3441Y-LN-02D. Back EMF [Ke] is 38.95 (Vpeak/Krpm). Continuous torque 2.495 lb-ft. User manual. I want to run the actuator coupled with the BLDC motor 60:1 gear ratio in reverse. So the ...
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1answer
38 views

Zero cross control for inductive loads

Is zero cross control acceptable for small motors? I know it is bad to have voltage and current out of phase for inductive loads but wanted to know if it would not be harmful to small motors (< 500 ...
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What kind of motor is this? Looks more like a solenoid than a motor

I was going through a large box of random motors I got at a yard sale. I was sorting them for use in later projects when I came across a motor I couldn't classify. Long story short, the magic smoke ...
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1answer
63 views

How do I choose a motor to operate a rotary switching device?

I need to build a device that has a motor which operates a hefty rotary disconnect switch. The switch is spring loaded in the On and Off positions and I know the operating torque requirement of the ...
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2answers
77 views

Converting 0.6V 20A DC to AC (frequency ~ 240 Hz) [closed]

I will be driving ~1600 linear resonant actuators (LRA) in parallel (each requiring 0.6V @ 19 mA AC). As the buck regulator, I will be using TPS546C23 synchronous buck converter from TI to convert 5V ...
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31 views

How do I connect wires to this micro stepper motor?

I want to use these motors for a small tactile display but I'm not sure how to connect to the motor connections they're so small. I was thinking about potentially using a semi-rigid PCB. If so is this ...
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30 views

How to express a logic sequence of a control circuit operation for a motor control center?

I have a customer to which I need to explain the logic sequence of the operation of the motor control centre's control schematics. The MCC has a complex RVSS unit for which the logic sequence has a ...
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Motor current calculations?

So i've got a question about electrical motors. I put 5V through a small motor and my lab bench PS reads 150mA. If I calculate this using ohms law, my motor resistance should be approximately 33Ω, but ...
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Building an ultralight electric hoist, what gearbox reduction / motor combination for torque / power requirements? [migrated]

I am building an electric hoist. Design requirements: Lightweight Quiet Relatively low lifting requirements (100 kg) Relatively fast lifting speed (80 fpm -> .4 m/s) Low cost Simple Force ...
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1answer
47 views

Problem with the pulses given by the motor encoder

I'm experimenting with differential encoder and I have some questions now. First specs: motor reduction is 14:1 on official page, encoder count 512 pulses per revolution so that mean that on one full ...
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1answer
29 views

BLDC Motors: Calculating the offset between rotor flux angle and rotary encoder Measurement

I am using an AS5147 Rotary Sensor to measure the position of a BLDC Motor. The motor is a 11 pole BLDC/PMSM. I have my own inverter circuit and right now doing a look up table based Space Vector PWM ...
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95 views

Unknown Component Identification

My friend and I are repurposing an old rc car. We're trying to wire up the steering, but we've never seen the type of motor that it uses for steering. It has 7 wires. What is this component and how do ...
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1answer
30 views

Routine Tests on Motor

I was going through the standards related to motor testing that are IS 12615, IS 15999-1, IS 15999-2-1 while reviewing a motor with requirements of 3phase induction motor, 1500rpm, 120hp, 415V and ...
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What capacitor do i need for a 3phase 50HP motor

Hi currently have a 3phase 50HP motor with an 80% Power factor I need to bring it up 95% power factor. What capacitor size would i need to achieve this. If someone can show the formulas they used that ...
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Overvolting brushed motors by 0.2V

For RC models, I own several brushed motors which are intended to operate at 7,2V. According to my previous tests, they usually take 25 amps, 30 being the absolute maximum. To divide by two the weight ...
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2answers
31 views

Adjusting overload relay for single-phase motor [closed]

For an overload relay on a magnetic starter, what should the overload current be set at? I'm not sure whether this should be set to the rated running current of the motor, or an approximation of the ...
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33 views

How to prevent the fluctuation of LEDs due to motor and music with loud bass?

I have a 12V DC power supply/battery supplying a class D audio amplifier, 12V DC linear actuator (controlled by Raspberry Pi through an H-bridge,) LCD screen and LED light strip (lighting intensity ...
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1answer
652 views

Sewing machine motor repair

I'm a sewing machine mechanic, trying to increase my electric motor knowledge. I have a Bernina 830 sewing motor where the carbon brushes ran down and the wire damaged the commutator and ran a groove ...
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73 views

Soft starter for centrifugal pump [closed]

Do most manufactured centrifugal pumps come equipped with soft starters, and is it a good idea to invest in one if they're going to be frequently switched on/off?
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1answer
38 views

Rotor Current and Torque Producing Current in Induction Motor

Is rotor current of an Induction motor always same with torque producing current? In torque equation of Induction motor, there is also one factor called rotor power factor. if rotor current and torque ...
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25 views

Can a faulty motor cause issues to another motor?

This is regarding the circuit of my 3D printer mainboard. I had an obersvation: It has a cooling fan (40X10 24V) which is having issues lately - it stops working sometimes, and when pushed to rotate, ...
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2answers
52 views

Controlling AC motor with relay vs. switch on motor

Is there a difference in terms of operation between switching a relay connected to mains for an AC motor versus opening/closing a switch on the motor? Would the internal protection circuitry ...

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